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Gloss
Mike,
Most paints, including umbers, will not fade (or go flat) as you refer unless one uses turps or OMS with them. Retouch varnish is simply varnish that is cut with thinner. I don't use any spray of any kind any longer. You can make your own retouch that you can brush on to give your work a sheen. That transparent look of mediums may simply require you to use mediums to get. If you like the look go for it. Numerous paintings in the museums have used it heavily.
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Hybrid Mode
